System for removing paraffin blockage of oil pipe

Abstract

The invention discloses a system for removing the paraffin blockage of an oil pipe. The system mainly comprises an outer pipe, a well washing pipe, an upper seal, a lower seal, a self-switching tee joint, a pump, a cleaning liquid pipeline and a heater, wherein the lower end of the outer pipe is fixedly arranged on a wellhead Christmas tree and is communicated with an oil production pipe arranged at the bottom of the wellhead Christmas tree; the lower end of the well washing pipe sequentially passes through the outer pipe and the wellhead Christmas tree, and extends into the oil production pipe; the space between the outer pipe and the well washing pipe is divided into a closed ring space section by the upper seal and the lower seal; the self-switching tee joint is arranged on the well washing pipe and in the closed ring space section; the two ends of the cleaning liquid pipeline are respectively connected with a liquid inlet and a liquid outlet which are arranged on the wall of the outer pipe; the cleaning liquid pipeline is provided with the pump and the heater. After the structural form is adopted, the system is convenient for offshore oilfield paraffin blockage removal operation, and has the characteristics of being simple and convenient to operate, low in cost and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of offshore oilfield engineering, in particular to a system for removing oil pipe wax plugging. Background technique [0002] In the process of oil exploitation, the waxing of the oil well will cause the oil pipe to shrink, affect the normal production of the oil well, and even block the production oil pipe, causing the oil well to stop production. Solidification in the tubing string plugs the production tubing. Once the production tubing is completely blocked, conventional means cannot be used to remove the wax blockage. Coiled tubing is used for circular flushing in the production tubing, which can remove wax plugging, but the operation cost of coiled tubing is high, and some production platforms have limited hoisting capacity, so it is impossible to hoist the coiled tubing to the platform for wax removal operations; wax removal drills can be used to scrape the inside of the tubing Oil and wax, but this ...

AI Technical Summary

Problems solved by technology

[0004] The above technical solution uses electric current to heat the oil extraction pipe to dissolve the paraffin attached to the inner pipe wall of the oil absorption pipe. The practical application is not ideal. The patent is completely different from the above technical solutions

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